{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T05:53:04Z","timestamp":1792389184365,"version":"4.4.0"},"reference-count":67,"publisher":"eLife Sciences Publications, Ltd","license":[{"start":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T00:00:00Z","timestamp":1760313600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T00:00:00Z","timestamp":1760313600000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T00:00:00Z","timestamp":1760313600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["elifesciences.org"],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Tumors with low expression of interferon-stimulated genes (ISG) and antigen presentation (AP) genes respond relatively poorly to current immunotherapies. One of the early hallmarks of cancer is DNA hypomethylation in genomic repeat regions that can result in the expression of normally silenced endogenous \u2018viral\u2019 elements. Such epigenetic changes have the potential to augment anti-tumor immune responses as well as reduce tumor cell fitness through the generation of aberrant nucleic acid species (NAS) and consequent activation of NAS-sensing pathways. Therefore, tumor evolution should favor additional selective events that suppress NAS generation, possibly yielding specific therapeutic vulnerabilities. Here, we show that the lysine demethylase 5 (KDM5) family of epigenetic regulatory enzymes suppresses R-loop formation in genomic repeat regions specifically in cancer cells. We find that KDM5 inhibition in luminal breast cancer cells results in R-loop-mediated DNA damage, reduced cell fitness, and an increase in ISG and AP signatures as well as cell surface major histocompatibility complex (MHC) class I, mediated by RNA:DNA hybrid activation of the CGAS\/STING pathway. KDM5 inhibition does not result in DNA damage or activation of the CGAS\/STING pathway in normal breast epithelial cells, suggesting that KDM5 inhibitors may enable a wide therapeutic window in this setting, compared to STING agonists or type I interferons. These findings provide new insights into the interplay between epigenetic regulation of genomic repeats, R-loop formation, innate immunity, and cell fitness in the context of cancer evolution and therapeutic vulnerability.<\/jats:p>","DOI":"10.7554\/elife.106249","type":"journal-article","created":{"date-parts":[[2025,5,6]],"date-time":"2025-05-06T10:46:09Z","timestamp":1746528369000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.106249","source":"Crossref","is-referenced-by-count":4,"title":["KDM5 demethylases suppress R-loop-mediated \u2018viral mimicry\u2019 and DNA damage in breast cancer cells"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-8110-4949","authenticated-orcid":true,"given":"Lena","family":"Lau","sequence":"first","affiliation":[{"name":"Pfizer Center for Therapeutic Innovation","place":["San Francisco, United 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